| Video Surveillance, for its great advantages, such as visualization, convenience, accuracy, and be full of rich information, now, is widely used in many fields, such as traffic, public social order, national defense, etc. Simultaneously, since the importance of family safety is ceaselessly increasing, Video Surveillance will play the more important role in the future.For the disadvantages of traditional Video Surveillance, such as complex frame, lower stability and reliability, higher price and limited transfer distance, it no longer satisfies the people's needs. Until recent years, as the fast development of computer, network, image processing, electronics and telecommunications, a new kind of video surveillance is given birth to change this situation, which is called The Embedded Network Video Surveillance.Aiming at video surveillance system's actual requirements combined with embedded technology, Image Processing Technology and network technology, a kind of embedded net video surveillance system is designed and implemented with good real-time capability, high reliability and low cost in this paper. ARM Microprocessor is used as hard platform and Linux OS with predominance, such as, abundance development source and free, etc, is used as software development platform in the surveillance system. Ethernet is used as net transport medium, and TCP/IP network protocol is used in the system. Moreover, video data is transported by RTP/RTCP transport protocol that supports multicast technology, video display is implemented based on SDL library under Linux OS on client. This paper firstly prescribes the embedded system, video surveillance and some related technology; analyzes the development status and trends of video surveillance system at home and abroad, elaborates the background and meaning of video surveillance system study, discusses some common video surveillance solutions, and contrasts to several prevalent video compression. Secondly, this paper brings forward the soft and hard ware general frame of embedded video surveillance system, and gradually chooses and details the design of hardware platform and software module. Of which, according to the needs of video data collection and solution, the hardware platform chooses camera and memorizer; in the software design process, the cross development environment construct of embedded system is firstly finished, and aiming at ARM-Linux, Linux OS and file system are transplanted to demo board. Finally, the video collections by v41 which are under the Linux operating system, JPEG video compression, RTP/RTCP transport protocols, SDL video display and the save of avi format video files are finished.Besides, this paper also particularly discusses some key technology which are used in the system constructing process. And it may have a certain reference value to those who study the related fields. |
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